cover D.O. Blood & Co., Philadelphia, Pa., (2c) Black (15L5), margins all around, small ms. cancel, used on 1847 folded cover to Baltimore, blue 'Philada Pa. 5 cts Apr 2' c.d.s., tied by cover file fold resulting in light crease, otherwise fine, ex Stewart, with 1990 P.F. certificate (which erroneously states that the stamp is no. 15L6), Scott retail $550.00 photo